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在单相管移动参数模型的研究中仅根据时间常数来确定移动函数,不能恰当地反映实际状况。该文基于单相管理论传递函数,明确了动态参数在移动函数的选择过程中的决定性意义。借助于解析方法,发现原模型仅仅当动态参数在2左右时适用。对于不同的动态参数,需要采用不同的移动函数。因为动态参数越大则对象的纯延迟越大,所以要求移动函数的变化速度越快。以常用的高精度传递函数的响应曲线为参考比较了多种移动函数的特性。给出了由动态参数决定的移动函数的具体选取方式。结果表明,修正后的模型可以更准确地描述常用热工设备的运行状况。
In the study of the single-phase pipe moving parameter model, the moving function is only determined according to the time constant, which can not properly reflect the actual situation. Based on the single-phase transfer theory, this paper defines the decisive significance of the dynamic parameters in the selection process of the moving functions. By means of analytic method, it is found that the original model only applies when the dynamic parameters are around 2. For different dynamic parameters, need to use different movement function. Because the greater the dynamic parameters of the object the greater the pure delay, so the faster the change of the moving function is required. The characteristics of many kinds of moving functions are compared with the response curves of commonly used high-precision transfer functions. The exact selection of the moving function which is determined by the dynamic parameters is given. The results show that the revised model can more accurately describe the operation of commonly used thermal equipment.